The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 26, 1999
Filed:
May. 07, 1997
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
The present invention provides a magnetic recording medium, which has high dispersion property, high breaking extension and excellent running durability. The magnetic recording medium comprises a magnetic layer having at least one layer of ferromagnetic powder and a binder, said magnetic layer being placed on a non-magnetic support member, whereby said binder contains at least a polyurethane resin (A) and a polyether polyester urethane resin (B), said polyurethane resin (A) contains a polyol with molecular weight of 500 to 5,000 by 0 to 50 weight %, said polyol being obtained by adding alkylene oxide to a diol having cyclic structure, said polyurethane resin (A) also contains a diol having cyclic structure and/or a short-chain diol with molecular weight of 200 to 500 by 15 to 50 weight %, said short-chain diol being obtained by adding alkylene oxide to diol, said polyurethane resin contains ether groups obtained from said diol and said polyol by 1.0 to 5.0 mmol/g to the total quantity of the polyurethane resin.